<template>
  <div>
     <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区 -->
      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom',i1==0 ? 'bdtop':'','vcenter']" v-for="(item1,i1) in scope.row.children" :key="item1.id">
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级 三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套 渲染二级菜单 -->
                <el-row :class="[i2==0 ? '' : 'bdtop','vcenter']" v-for="(item2,i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag closable @close="removeRightById(scope.row,item2.id)" type="success">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag closable type="warning" v-for="(item3) in item2.children" :key="item3.id" @close="removeRightById(scope.row,item3.id)">
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>{{scope.row}}</pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)" @close="setRightDialogClose">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%">
      <!-- 树形控件 -->
      <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      rolelist:[],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible:false,
      // 所有的权限数据
      rightslist:[],
      // 树形控件的属性绑定
      treeProps:{
        label:'authName',
        children:'children'
      },
      // 默认选中的节点id数组
      defKeys:[],
      // 当前即将分配权限的角色id
      roleId:''
    }
  },
  created() {
    // 获取所有角色列表
    this.getRoleList()
  },
  methods:{
    // 获取所有角色列表
    async getRoleList() {
      const {data:res} = await this.$http.get('/roles');
      if(res.meta.status !==200) {
        return this.$message.error('获取角色列表失败!')
      }
      this.rolelist=res.data;
      console.log(this.rolelist);
    },
  // 根据id删除用户
    async removeRightById(role,rightId) {
      // 弹框提示用户是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err=>err)
        if(confirmResult !=="confirm") {
          return this.$message.info('已取消删除!')
        }
        const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`);
        if(res.meta.status!==200) {
          return this.$message.error('删除权限失败!')
        }
          this.$message.success('删除成功')
          // 返回的最新列表
          role.children=res.data
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId=role.id
        // 获取所有权限的数据
      const {data:res} = await this.$http.get('rights/tree');
      if(res.meta.status!==200) {
        return this.$message.error('获取权限列表失败!')
      }
        // 获取到的所有数据保存到rightslist变量中
        this.rightslist=res.data
        // 递归获取三级节点的id
        this.getLeafKeys(role,this.defKeys)
        // 展开分配权限的对话框
        this.setRightDialogVisible=true
        
    },
    // 通过递归的形式 获取角色下所有三级权限的id值 保存到defkeys 数组中
    getLeafKeys(node,arr) {
      // 如果当前 node 节点不包含children 属性 则是三级节点
      if(!node.children) {
        
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKeys(item,arr))
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClose() {
      // 关闭时清空选中的id
      // 此处小bug
      this.defKeys=[]
    },
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idstr =keys.join(',')
      const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids:idstr})
      if(res.meta.status!==200) {
        this.$message.error('分配角色权限失败!')
      }
        this.$message.success('分配角色权限成功');
        // 重新获取角色权限数据
        this.getRoleList();
        // 关闭角色分配权限对话框
        this.setRightDialogVisible=false
    }
  }
  
}
</script>
<style lang="less" scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
.vcenter {
  display: flex;
  align-items: center;
}
</style>